A tiny pillow key chain:
I know you need sleep. You can’t sleep this tiny pillow but you can bring this light-able pillow with you all day long.
Arduino caps:
Great for bikers. The board will be fixed on the edge so that people all know how this works..
Earrings that can emit light.
Turn those on in a club with customized styles (colors options and fading effects and more)
Hi Zihan, great brainstorm! Remember that the project is about light diffusion in soft materials! You could definitely execute the keychain idea with a few led sequins:
https://www.adafruit.com/?q=led%20sequin
and small battery pack: https://www.adafruit.com/product/1871
LED earrings certainly exist:
https://sc01.alicdn.com/kf/HTB1SJORJVXXXXcsXpXXxh4dFXXXp/200426652/HTB1SJORJVXXXXcsXpXXxh4dFXXXp.jpeg
https://ae01.alicdn.com/kf/HTB1JLlCOXXXXXXjXXXXq6xXFXXXE/Fashion-Party-Accessories-Flashing-font-b-LED-b-font-font-b-Earrings-b-font-font-b.jpg
and consist of tightly packed, mostly hard materials, What about a LED fuzzy keychain instead?
https://www.dhresource.com/0x0s/f2-albu-g2-M01-8A-94-rBVaGlYCOH6AKtd0AAX4GY7t4Lo975.jpg/10colors-lovely-fur-ball-bag-accessories.jpg
Good! Thanks for all the info. I think I might start with the keychain!